package com.christina.service.domain.travel.impl;

import com.christina.service.domain.travel.TravelDomainService;
import com.christina.service.domain.travel.model.TravelPlanRequest;
import com.christina.service.domain.travel.model.TravelPlanResult;
import com.christina.service.MessageQueueService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.ai.chat.client.ChatClient;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Arrays;

/**
 * 出行领域服务实现
 * 
 * @author Christina
 */
@Slf4j
@Service
public class TravelDomainServiceImpl implements TravelDomainService {

    private final ChatClient chatClient;
    private final MessageQueueService messageQueueService;

    public TravelDomainServiceImpl(ChatClient chatClient, MessageQueueService messageQueueService) {
        this.chatClient = chatClient;
        this.messageQueueService = messageQueueService;
    }

    @Override
    public TravelPlanResult planTravel(TravelPlanRequest request) {
        return createTravelPlan(request);
    }

    @Override
    public TravelPlanResult createTravelPlan(TravelPlanRequest request) {
        log.info("创建出行规划: {} -> {}", request.getOrigin(), request.getDestination());
        
        try {
            // 使用AI生成出行方案
            String aiPrompt = buildTravelPlanPrompt(request);
            String aiResponse = chatClient.prompt(aiPrompt).call().content();
            
            // 构建出行规划结果
            TravelPlanResult result = TravelPlanResult.builder()
                .planId(System.currentTimeMillis())
                .userId(request.getUserId())
                .status(TravelPlanResult.PlanStatus.COMPLETED)
                .recommendedRoutes(generateRecommendedRoutes(request, aiResponse))
                .suggestions(Arrays.asList(aiResponse.split("\\n")))
                .createTime(LocalDateTime.now())
                .build();
            
            // 设置最优路线
            if (!result.getRecommendedRoutes().isEmpty()) {
                result.setBestRoute(result.getRecommendedRoutes().get(0));
            }
            
            // 发送异步通知
            messageQueueService.sendNotificationMessage(
                request.getUserId(),
                "TRAVEL_PLAN_COMPLETED",
                "您的出行规划已完成，请查看详情"
            );
            
            log.info("出行规划创建完成: planId={}", result.getPlanId());
            return result;
            
        } catch (Exception e) {
            log.error("创建出行规划失败", e);
            return TravelPlanResult.builder()
                .planId(System.currentTimeMillis())
                .userId(request.getUserId())
                .status(TravelPlanResult.PlanStatus.FAILED)
                .suggestions(Arrays.asList("出行规划生成失败，请稍后重试"))
                .createTime(LocalDateTime.now())
                .build();
        }
    }

    @Override
    public TravelPlanResult optimizeTravelPlan(Long planId, String optimizationCriteria) {
        log.info("优化出行规划: planId={}, criteria={}", planId, optimizationCriteria);
        
        // 实现出行方案优化逻辑
        // 这里可以调用AI进行方案优化
        
        return TravelPlanResult.builder()
            .planId(planId)
            .status(TravelPlanResult.PlanStatus.COMPLETED)
            .suggestions(Arrays.asList("出行方案已根据" + optimizationCriteria + "进行优化"))
            .createTime(LocalDateTime.now())
            .build();
    }

    @Override
    public String getTravelSuggestions(TravelPlanRequest request) {
        log.info("获取出行建议: {} -> {}", request.getOrigin(), request.getDestination());
        
        try {
            String prompt = String.format("""
                请为以下出行需求提供专业建议：
                
                出发地：%s
                目的地：%s
                出发时间：%s
                出行人数：%d人
                预算：%s
                
                请提供：
                1. 最佳出行方式建议
                2. 时间安排建议
                3. 费用预算建议
                4. 注意事项
                """,
                request.getOrigin(),
                request.getDestination(),
                request.getDepartureTime(),
                request.getPassengerCount(),
                request.getBudgetLimit() != null ? request.getBudgetLimit() + "元" : "无限制"
            );
            
            return chatClient.prompt(prompt).call().content();
            
        } catch (Exception e) {
            log.error("获取出行建议失败", e);
            return "暂时无法获取出行建议，请稍后重试";
        }
    }

    @Override
    public Object bookTravelService(Long planId, String serviceType) {
        log.info("预订出行服务: planId={}, serviceType={}", planId, serviceType);
        
        // 实现预订逻辑
        // 这里可以集成第三方预订服务
        
        return "预订功能正在开发中，敬请期待";
    }

    @Override
    public boolean cancelTravelPlan(Long planId, String reason) {
        log.info("取消出行规划: planId={}, reason={}", planId, reason);
        
        // 实现取消逻辑
        // 发送取消通知
        
        return true;
    }

    /**
     * 构建出行规划AI提示词
     */
    private String buildTravelPlanPrompt(TravelPlanRequest request) {
        return String.format("""
            请为以下出行需求制定详细的出行方案：
            
            基本信息：
            - 出发地：%s
            - 目的地：%s
            - 出发时间：%s
            - 出行人数：%d人
            - 预算限制：%s
            - 优先级：%s
            
            请提供：
            1. 推荐的交通方式和具体班次
            2. 详细的时间安排
            3. 费用预算分析
            4. 路线优缺点分析
            5. 实用的出行建议
            
            请以结构化的方式返回，便于用户理解。
            """,
            request.getOrigin(),
            request.getDestination(),
            request.getDepartureTime(),
            request.getPassengerCount(),
            request.getBudgetLimit() != null ? request.getBudgetLimit() + "元" : "无限制",
            request.getPriority() != null ? request.getPriority() : "综合平衡"
        );
    }

    /**
     * 生成推荐路线
     */
    private java.util.List<TravelPlanResult.TravelRoute> generateRecommendedRoutes(
            TravelPlanRequest request, String aiResponse) {
        
        java.util.List<TravelPlanResult.TravelRoute> routes = new ArrayList<>();
        
        // 基于AI响应生成路线（简化实现）
        TravelPlanResult.TravelRoute route = TravelPlanResult.TravelRoute.builder()
            .routeId("ROUTE_" + System.currentTimeMillis())
            .description("AI推荐路线")
            .totalDuration(300) // 5小时
            .totalCost(request.getBudgetLimit() != null ? request.getBudgetLimit() * 0.8 : 500.0)
            .comfortScore(8)
            .recommendScore(9)
            .segments(generateRouteSegments(request))
            .build();
        
        routes.add(route);
        return routes;
    }

    /**
     * 生成路线段
     */
    private java.util.List<TravelPlanResult.RouteSegment> generateRouteSegments(TravelPlanRequest request) {
        java.util.List<TravelPlanResult.RouteSegment> segments = new ArrayList<>();
        
        TravelPlanResult.RouteSegment segment = TravelPlanResult.RouteSegment.builder()
            .transportMode("HIGH_SPEED_RAIL")
            .departureLocation(request.getOrigin())
            .arrivalLocation(request.getDestination())
            .departureTime(request.getDepartureTime())
            .arrivalTime(request.getDepartureTime().plusHours(5))
            .duration(300)
            .cost(500.0)
            .details("G1234次高铁 二等座")
            .build();
        
        segments.add(segment);
        return segments;
    }
}